#app{
    position: relative;
    width: 100%;
    height: 100%;
}
.item_file{
    width: 230px;
    height: 170px;
    margin: 10px;
    cursor: pointer;
    float: left;
}
.log_hover:hover{
    transition: 1s all;
    transform: scale(1.01);
    box-shadow: 0px 0px 1px 1px gray;
}
.item_file:hover{
    transition: 0.5s all;
    transform: scale(1.05);
    box-shadow: 0px 0px 3px 3px lightgray;
}
.item_img{
    width: 200px;
    height: 120px;
    display: block;
    margin: auto;
}
.t1{
   width: 100%;
    font-size: 15px;
    text-align: center;
    font-weight: bold;
    font-family: "微软雅黑";
    color: #409EFF;
}
.t2{
    width: 100%;
    font-size: 15px;
    text-align: center;
    font-weight: bold;
    font-family: "微软雅黑";
    color: #409EFF;
}